* {
  margin: 0;
  padding: 0;
}
body {
  height: 100vh;
  /* 弹性布局 居中 */
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #eee;
}
.table-box {
  width: 800px;
  max-width: 90vw;
  position: relative;
}
table {
  width: 100%;
  background-color: #fff;
  border-spacing: 0;
  border-collapse: collapse;
  table-layout: fixed;
}
th {
  background-color: #e7f3ff;
  height: 25px;
  cursor: pointer;
}
th,
td {
  color: #333;
  font-size: 15px;
  text-align: center;
  padding: 8px 10px;
  border: 1px solid #ddd;
}
/* 悬浮层 */
.box {
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  height: 100%;
  text-align: center;
  position: absolute;
  top: 0;
  left: 0;
  cursor: move;
  display: none;
}
.box p {
  line-height: 37.5px;
  font-size: 15px;
}
